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*KEYNOTE* Tailoring Master Alloys for Liquid Phase Sintering: effect of introducing oxidation-sensitive elements

  • : Raquel de Oro Calderon1, Elena Bernardo Quejido2, Monica Campos2, Christian Gierl1, Herbert Danninger1, Jose Manuel Torralba Castello2
  • : 1Technical University of Vienna, 2Universidad Carlos III de Madrid
  • : PDF Download
  • : 2015

Abstract

The use of a low melting point master alloy powder contributes beneficially for sintering by increasing the diffusion rate of the alloying elements, enhancing homogenization and in some cases also promoting densification. However, working with liquid phases poses important challenges like maintaining a proper dimensional control and minimizing the effect of secondary porosity on the final performance of the steel.The type of interaction between liquid master alloy and iron base powders (inert, dissolutive or reactive) has an important effect on the wetting/infiltration properties of the liquid, and affect microstructural development and dimensional stability. In this work, three different master alloy systems are compared: a low dissolutive Cu-based MA (dissolving up to 1.5 wt.% of iron), and two systems with a higher degree of iron dissolution but different content in oxidation-sensitive elements, Ni-based MA ( dissolution ~35 wt.%) and Fe-Mn-Si based MA (dissolution ~20 wt.%). Wetting experiments and step sintering tests show how the evolution of the microstructure, dimensional stability and overall densification are strongly affected by the characteristics of the liquid master alloy and in particular by the dissolutive character of the liquid, and the amount of oxidation-sensitive elements present.The methodology presented in this work proves that thermodynamic calculations combined with wetting experiments and thermal analysis techniques provide key information for the design of liquid phase formers, and allow predicting- from the design stage- critical aspects such as final densification, dimensional stability and microstructure development.

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